I always have to gut out the first 5-10 minutes of seated meditation, where my mind really struggles against it. Then it gives over and the rest is marvelous. Like a silent retreat, one of the major objectives is the experience of release, when your mind finally surrenders. Your mind is not you. You can make it do what you want.
Some of us have physical, not necessarily mental issues, that make seated meditation (in any position) virtually undoable. Sitting still + focusing on breathing or nothing = rapid chronic pain flareup. That's why a standing form that specifically includes miniscule adjustments is at least somewhat doable + gives me something to deal with. Walking meditation even better. chacun a son gout. (yes, a pun too, tho the ailment is not mine)